Extendable shore



June 22, 1965 R. K. SQUIRE 3,190,405

EXTENDABLE SHORE Filed June 50, 1961 2 Sheets-Sheet 1SI!HI!!!llllllllllllllllllilllll INVENTOR. 2055:7764 540/35 BY gfiring/taxi June 22, 1965 R. K. squmz 3,

EXTENDABLE snonm Filed June 30. 1961 2 Sheets-Sheet 2' INV EN TOR. 05.5016 52 0/25 Arne/14ers United States Patent Office 3,190,405 PatentedJune 22, 1965 3,190,405 EXTENDABLE SHORE Robert K. Squire, Los Angeles,Calif assignor to Superior Scaffold C0., Torrance, Calif, a corporationof California Filed June 30, 1961, Ser. No. 120,985 8 Claims. (Cl.18913) The present invention relates to extendable shores or shoringscaffolds for adjustably supporting a load.

A weakness of known extendable shores or shoring scafof the shoringscaffold progressively decreased as the shore was extended. According tothe present invention, cross bracing is installed between the extensionframes and the base frames of the shoring scaffold, with the connectionof the braces to the base frames being effected through adapter pinsadjustably mounted in the base frames and carrying the weight of theextension frames and the load supported by the shoring scaffold. Thisconstruction serves to rigidify the shoring scaffold and to increase theload bearing capacity thereof in extended position, While at the sametime providing for faster setups and lower labor costs. Further, thescaffold or shoring height i's-variable over a wide range while usingonly two types of end frames comprising two basic units, a base frameand an extension frame. The base frames are usable in any desired numberin superposed relation and with an extension frame forming the top unitin order to secure the necessary scaffold or shoring height.

It is, therefore, an object of the present invention to provide animproved extendable shore or shoring scaffold.

Another object of this invention is the provision of an improvedextendable shoring scaffold having increased rigidity and load bearingcapacity.

A further object of this invention is the provision of an extendableshoring scaffold which may be set up and effectively braced in a minimumof time.

A still further object of this invention is the provision of an improvedextendable shore or shoring scaffold employing base and extension frameswith telescoping legs and an adapter pin mounted in and adjustablevertically of the base frame and carrying the weight of the extensionframe plus the supported load, in which the adapter pin acts as a bracepoint for rigidifying cross braces connected between the extension andbase frames.

These and other objects and features of this invention will be readilyapparent to those skilled in the art from the following specificationand the appended drawings, in which:

FIGURE 1 is a perspective view of the shore or shoring scaffoldaccording to the present invention;

FIGURE 2 is a detail sectional view of a screw jack used with theshoring scaffold of FIGURE 1;

FIGURE 3 is a detail view of the junction between two base frames of thescaffold, broken away to show the coupling pin therebetween;

FIGURE 3:: is a detail sectional view on the line 3a of FIGURE 3;

FIGURE 4 is a perspective view of the adapter element mounting theadapter and tie pins;

FIGURE 5 is a sectional view of the joint between the legs of the baseand extension frames;

6-6 of FIGURE 5;

FIGURE 7 is a view similar to FIGURE 5 showing a modified form ofextension leg mounting with the adapter pin passing therethrough; and

FiGURE 8 is a transverse sectional view, similar to FIGURE 6, butshowing a modified form of adapter element in which the adapter pin andaligned tie pin are connected together and are separable from theadapter element.

The shoring scaffold 11 of FIGURE 1 is illustrated as made up of twopairs of base frames 12-13 and 14-15. Mounted in and above the baseframes 12-13, with their legs telescopically interengaged, are extensionframes 16- 17. Screw jacks 18 are provided at the bottom of the baseframes 14-15 for leveling of the frames and the shoring scaffold, whilescrew jacks 19 are provided at the top of the extension frames 16-17 forfine adjustment of the head of the shoring scaffold.

The base frames 12-15 are identical in construction, each comprising apair of horizontally spaced, vertical legs 21 and 22 having a pair ofhorizontal struts 23-24 rigidly connected thereto adjacent theiropposite ends, as by welding. Cross struts 25-26 are rigidly secured, asby welding, to the vertical legs 21-22 intermediate the horizontalstruts 23-24, and the cross struts are welded together at their crosspoint 27. A horizontal rigidifying strut 28 interconnects the crossstruts 25-26.

The vertical legs 21-22 are provided with spaced through holes 29 alongtheir length for the reception of adapter pins to adjustably support thelegs of an extension frame. The axes of the holes 29 are parallel to theplane of the base frame. Through holes 31 are provided adjacent theopposite ends of the legs 21-22 with the axes of the holes 31 extendingat right angles to the plane of the base frame.

Two pairs of base frames are shown in FIGURE 1, and it will be readilyapparent that this number may vary from one pair to any desired numberof pairs of superposed base frames which may be required to reach thedesired shoring height. The superposed base frames are connectedtogether in the manner shown in FIGURES 3 and 3a of the drawings. Acoupling pin 32, having a cross-shaped body portion with the width ofthe legs of the cross substantially equal to the interior diameter ofthe tubular legs 21, is received within the adjacent ends of the legs. Acentral disk 33, having a diameter greater than the internal diameter ofthe legs, properly locates the coupling pin with respect to each leg ofthe base frame. The ends of the coupling pin 32 are provided with holes34 which align with the holes 31 in the legs 21 and through the openings31, 34 are disposed bolts 35 serving to connect the adjacent ends of thelegs of the base frames together through the coupling pin 32 Each of thebase frames 12-15 is provided with four tie pins 30 mounted in opposedrelation adjacent the opposite ends of the legs 21-22, upon the mutuallyfacing surfaces of the legs. The pins 30 are butt welded to the surfacesof the legs 21-22 and have transverse openings therein adjacent theirends for the reception of nails or cotter pins to hold the cross bracesthereon.

For each pair of base frames 12-15 there are provided a pair of frontcross braces 43 and 44 and a pair of rear cross braces 45 and 46. Thecross braces 43-46 are provided with flat end portions 47 havingopenings 48 therethrough in which are received the pins 30. The crossbraces extend from the lower pins 30 on one frame of each pair ofhorizontally spaced frames to the upper pins 30 on the opposite frame ofthe pair.

Each of the extension frames 16-17 comprises a pair of vertical legs36-37 joined together adjacent their upper ends by .a pair of verticallyspaced horizontal struts 38 and 39 welded at their opposite ends to thelegs 36-37. Angular struts 41 and 42 interconnect the horizontal struts38 and 39 to strengthen the extension frames 16-17. The exteriordiameter of the legs 36-37 is slightly less than the interior diameterof the legs 21-22 so that the lower ends of the legs 36-37v may betelescopically received within the upper ends of the adjacent legs 21-22of the base frame. r

An adapter element for adjustably supporting the extension frame and itsrelation to the legs 36-37 and 21- 22 'is more particularly shown inFIGURES 4 through 6. The adapter elementis indicated generally at 51 ascomprising an. adapter pin 52 butt welded at one end to the innerface'of the leg 53 of an L-shaped bracket 54. The adapter pin 52 has atransverse hole 55 adjacent its free end for the reception of aretaining nail or cotter pin. On the outer face of the leg 53 is buttWelded a tie pin 56. On the outer face of the base leg 57 of theL-shaped bracket 54 is butt welded a tie pin. 58, the tie pins havingvertical holes adjacent their endsfor the reception of retaining nailsor cotter pins.

FIGURES 5 and 6 show the adapter element 51' in position supporting theend of the leg 36. The adapter pin 52 extends through the selected hole29 through the V tubular leg 21' of the base frame, and is retained ininserted position by a cotter pin 59 extending through the hole 55. Thelower end of the leg 36 is received withinthe upper end of the leg 21 intelescoping relation," with the bottom of the leg 36 bearing against thepin 52 which thus supports the extension frames 16-17 and the loadcarried thereby. 1 r

The frames 16-17 are providedwith tie pins adjacent the upper ends ofthe legs 36 and 37 as at761 andv 62. These pins are'butt welded to theexterior surfaces of the legs 36-37, pins 61 extending outwardly towardthe front 21-22 of the frames 14-15, and the upper base frames12-13mounted over the pins 32 and additional cross braces 43-46 appliedto the base frames 12-13, thus adding a second level to the scaffolding.Bolts may be passed through holes 31 and 34 to securely lock the upperlevel baserframes to the lower level frames;

The adapter elements 51 are now mounted-on the legs 21 22 of the upperlevel of the base frames 12-13 by inserting the adapter pins 52 throughthe'holes 29 at alevel selected to give the desired shoring height. Theextension frames 16-17 are .now mountedion the upper base frames byinserting the legs 36-37 into the legs 21-22 of" the upper base frames,with the endsof the legs 36-37 engaging the adapterl pins 52.v Crossbraces 63-66 arenow assembled to interconnectthe-tie' pins 61-on theextension frames with the tie pins 56 on the adapter elementsSl, and thecross braces 67-68 are assembled to interconnect the tie pins 62 on theextensionframes withthe tie pins 58 on the adapter elements 51. 1Lastly, jacks 19 may be assembled by inserting their rods 76 into theupperends of the legs 36-37 and the shoring scaffold is completed. Thisshoring scaffold may support any desired-load thereon, a simple platformbeing indicated at 85 in FIGURE 1. In the modification of FIGUREV theylower ends of the legs 36-37 are provided with through holes 86complementary to the holes 29 and'the adapter pin 52 extends meat 91infwhich the adapter pin 92 extends freely and back of the scaffold inthe plane of the frames--16-17,

and the pins 62 extending outwardly from the ends of the scaffold atright angles to the plane of the frames- 1647.

At the front of the scaffold 11 a pair of cross braces 63-64interconnect the pins '61 on the frames 16-17,

through an opening 90through the leg 93 of the L-shaped bracket 94.'Thetie pin 96 aligned with the adapter pin 92 has an integral head 95,to' the top of whichthe pin 92 is butt welded. The pins 92 and-96 thusform a unitary element which is separable from theL-shaped bracket 94.

and the pins 56 on the adapter elements 51. At the back I l of thevscaffold cross braces 65-66 interconnect the pins 61 on'the extensionframes 16-17 and the tie pins 56 on the adapter elements 51. End crossbraces 67'and 68 interconnect the pins 62 on the extension frames 16-17with V the tie pins 58 on the adapter elements 51. By means of the-crossbrace system 63-68 the extension frames 16-17 are braced with respect tothe base frameslZ-IS through the adapter elements 51 and the adapterpins 52 which 97 of the L-shaped bracket 94. The construction of FIG-URE '8 functions, after assembly, the same as, the structure of FIGURE6, but in readjusting the adapter ele ment 91 relative-to the legs 21-22of the base frame to 'sele-ctadifferent hole 29 and'a different level ofsupport,

the adapter elements andthe extension frames may be moved tofanother'location without removing the cross braces from the tie' pins 96' and98Whch are separated bythe withdrawal of the pin 92 from the opening 90.

connect to the legs 21-22 of the base frames through the holes 29. Itwill be readily understood that the height of the extension frames 16-17above the adjacent base frames 12-13 will be determined by the level ofthe holes 7 29 in which the adapter pins 52 are placed. The lower theholesselected, the greater will be the. telescoping of the complementarylegs on the extension and base frames' and the lower the shoring height.

The, jacks lsand 1-9 are shown in-section in FIGURE 2 as comprising abaseplate '71, which in inverted position becomes the shoring head,having a central boss 72 21-22 and 36-37. On the rod 76 is threaded aload supporting nut 77 having operating handles 78. The bore 73 isprovided with recesses 79: in which are received lugs 81 on the knob 75to provide for limited pivotal 76. The' knob 75 is maintained within thebore 73 by a snap ring 82; I

. In setting up the shoring scaffold 11 shown in FIG- used in anydesired number', and extensionframes adjustably-mounted on the upperbase frames; Only a small inventory of frames and cross braces-providesfull flexi- 'movement between the baseplate or head 71 and the rod 7 UREl, the baseframes 14-15 are first mounted'on the jacks 18 andinterconnected by the cross braces 43-46, thus forming a self-supportingstructure. The coupling pins 32. are then inserted in the upper endsofthe legs bility in scaffold construction. .The shoring scaffoldaccording to this invention is set up and-adequately braced 'ina minimumof time, and the. bracing is such as to tie the extension and adjacentbase frames together in a simple and effective mannen while at the sametime permittingthe. carrying of relatively heavy loads with theextension frame' in extended position." While FIGURE 1 shows but twobase frames 'at'the same level,'i-t is understood that additional baseframesat' the same level may 'be provided to'extend the length of theshoring scaffold, or an extended length scaffolding. may be provided byusing a plurality of the independentsets shown in FIG- URE 1,"

1 gWhile certain'preferred embodiments of the invention terms of thefollowing claims."

"Iclaim: v *1. An extendable shoring scaffold comprising: a pair ofhorizontally spaced base frames; bracing elements interconnecting saidbase frames; a pair of horizontally spaced extension frames mounted onsaid base frames in telescoping relation; adapter pins adjustablymounted in said base frames and engaged by said extension frames tosupport the extension frames and the load carried thereby; andvertically diagonal bracing elements of standard effective lengthinterconnecting points on said extension frames and said adapter pins torigidify said extension frames, said standard length bracing elementsinterconnecting the same points on the extension frames and the adapterpins regardless of the position of the adapter pins in the base framesand the amount of telescoping of the extension frames in the baseframes.

' 2. An extendable shoring scaffold comprising: a pair of horizontallyspaced base frames; bracing elements infterconnecting said base frames;a pair of horizontally spaced extension frames mounted on said baseframes in telescoping relation; adapter pins adjustably mounted in saidbase frames and engaged by said extension frames to support theextension frames and the load carried thereby; and vertically diagonalcross braces of standard effective length extending from said adapterpins to tie points adjacent to the tops of said extension frames andserving to rigidify said extension frames, said standard length crossbraces interconnecting said tie points adjacent the tops of theextension frames and the adapter pins regardless of the positions of theadapter pins in the base frames and the amount of telescoping of theextension frames in the base frames.

3.'An extendable shoring scaffold comprising: a pair of horizontallyspaced base frames; bracing elements interconnecting said base frames; apair of horizon-tally spaced extension frames mounted on said baseframes in telescoping relation; adapter pins adjustably mounted in saidbase frames and engaged by said extension frames to support theextension frames and the load carried thereby; L-shaped brackets havingsaid adapter pins butt welded to an interior face thereof; a pair of tiepins butt welded to the exterior faces of each of said brackets so thattheir axes extend at right angles to each other; tie pins mountedadjacent the upper ends of said extension frames with their axes atright angles to each other so as to be complementary to the tie pins onsaid brackets; and vertically diagonal cross braces of standardeffective length interconnecting the tie pins on said brackets and thetie pins on said extension frames and serving to rigidify said extensionframes, the same effective length cross braces interconnecting thebracket tie pins and the tie pins adjacent the upper ends of theextension frames regardless of the positions of the adapter pins in thebase frames and the amount of telescoping of the extension frames in thebase frames.

4. An extendable shoring scaffold comprising: a pair of horizontallyspaced base frames; bracing elements interconnecting said base frames; apair of horizontally spaced extension frames mounted on said base framesin telescoping relation; adapter pins mounted in said base frames andengaged by said extension frames to support the extension frames and theload carried thereby; tie-pin extensions integrally connected to saidadapter pins to form unitary structures therewith; L-shaped bracketshaving clearance holes therethrough receiving said adapter pins andserving to mount the brackets thereon; a tie pin extending outwardlyfrom the leg of each of the L-shaped brackets other than the legcontaining said clearance holes; tie pins connected to the extensionframes adjacent the upper ends thereof; and vertically diagonal crossbraces of standard effective length interconnecting the' tie pins onsaid bracket and the tie-pin extensions on said the base frames and theamount of telescoping of the extension frames in the base frames.

5. An extendable shoring scaffold comprising: a pair of horizontallyspaced base frames, each of said base frames comprising a pair ofhorizontally spaced vertical legs and struts interconnecting said legs;cross braces interconnecting said base frames to form a substantiallyself-supporting structure; a pair of horizontally spaced extensionframes, each of said extension frames comprising a pair of horizontallyspaced legs and struts interconnecting the legs, the legs of saidextension frames having an exterior diameter not exceeding the interiordiameter of the legs of said base frames and received telescopicallytherein; adapter pins adjustably mounted in any of a series ofvertically spaced holes in the legs of said base frames, said adapterpins being engaged by the legs of said extension frames so as to holdsaid extension frames in extended position and to support the weight ofsaid extension frames and the load carried thereby; and verticallydiagonal bracing means of standard effective length interconnecting saidadapter pins and the upper ends of said extension frames and serving torigidify said extension frames, said standard length bracing meansinterconnecting the upper ends of said extension frames and said adapterpins regardless of the positions of the adapter pins in the base framesand the amount of telescoping of the extension frames in the baseframes.

6. An extendable shoring scaffold comprising: a pair ofhor'izontallyspaced base frames, each of said base frames comprising a pair ofhorizontally spaced vertical legs and struts interconnecting said legs;cross braces interconnecting said base frames to form a substaniallyself-supporting structure; a pair of horizontally spaced extensionframes, each of said extension frames comprising a pair of horizontallyspaced legs and struts interconnecting the legs, the legs of saidextension frames having an exterior diameter not exceeding the interiordiameter of the legs of said base frames and received telescopicallytherein; adapter pins adjustably mounted in any of a series ofvertically spaced holes in the legs of said base frames, said adapterpins being engaged by the legs of said extension frames so as to holdsaid extension frames in extended position and to support the weight ofsaid extension frames and the load carried thereby; brackets mounted onsaid adapter pins, each of said brackets having a tie pin mountedthereon; tie pins mounted on said extension frames adjacent to the upperends of the legs thereof; and vertically diagonal cross braces ofstandard effective length interconnecting the tie pins on said bracketsand the tie pins on said extension frames and serving to rigidify saidextension frames, the same effective length cross braces interconnectingthe bracket tie pins and the tie pins adjacent the upper ends of theextension frames regardless of the positions of the adapter pins in thebase frames and the amount of telescoping of the extension frames in thebase frames.

7. An extendable shoring scaffold comprising: a pair of horizontallyspaced base frames; bracing elements interconnecting said base frames; asecond pair of base frames mounted on said first pair of base frames;bracing elements interconnecting said second pair of base frames, eachof said base frames comprising a pair of horizontally spaced verticallegs and struts interconnecting the legs, said base frame legs beingtubular; coupling pins inserted into the adjacent ends of the legs ofsaid first and second pair of base frames; securing means extendingthrough the cooperating legs of said base frames and said coupling pinsto tie said base frames together; a pair of horizontally spacedextension frames mounted on the upper pair of said base frames, each ofsaid extension frames comprising a pair of horizontally spaced verticallegs joined by struts adjacent their upper ends only, the legs of saidextension frames being telescopi- I cally'mountedv-on the legs of theupper pair of base frames; adapter'pins adjustablymounted in any of aseries-of vertically spaced holes in' thelegs of the: upper pair ofbaseframes and engaged by said extension frame legs to support theweigh't'of the. extension frames and the load carried thereby;-andvertically diagonal bracing 7 means of standard effective lengthinterconnecting said adapter pins and the upper ends of saidextension-frames and serving to rigidity said extension frames, the sameeffective lengthbracing means interconnecting the adapter pinsand the,upper ends of the extension framesregardless of the positions of theadapter, pins in the upper ba'se frames and the amountsfof telescopingof the extension frames in the; upper base frames;-

8. Anextendable shoring scaffold comprising a pair;

of horizontally spaced base frames; bracing elements interconnectingsaid base frames;;a second, pair of base frames mounted on said ,firstpair of base frames;- bracing elements interconnecting said,second'pairf of'base frames, each of said base frames'comprising a pairof horizontally spaced vertical legs and struts interconnect- 3 7 pairof base frames and engaged by said extension frame a series ofvertically spaced holes-in the legs of the upper legs tosupporttheweight of ,the extension frames and the load carried thereby; a;pair oftie pins mounted on said adapter pins with the axes of said tie pinssubstantially at right angles to each other; tie pins mounted 1 adjacentthe upper ends of eachof thelegs of the extension frames with the axesof thetie pins on each leg subing the legs,,said base frame legsbeingtubular; coupling pins inserted into the adjacent ends of thelegsfof said first and second pair of base frames; securing meansextending through thecoo'perating legs; ofsaid base I framesand saidcoupling pins to tie saidbase frames together; a pair ofhorizontally'spaced; extension frames mounted on the upper pair of saidbase frames, each of said extension 'frames comprisingfa pair; ofhorizontally spaced'verticalj legs joined: by struts adjacenttheir upperends only, the legs of said. extension frames being telescopicallymounted on the glegs of the; .upper pairKof b'aseframes; adapterpinsadjustably mounted in any'of stantially at right angles to eachother;and vertically diagonal cross braces of standard effective lengthinterconnecting thetie pins on said adapter pins and the tie pins onsaid extension frames and serving to rigidify said extension frames, thesame effective length cross braces interconnecting the tie pins onthe'adapter pins and the tie pinsadjacent the upper ends of theextension frames regardless of thepositions 0f the adapter pins in theupper base frames and the amount of telescoping of the extension framesin the upperbasev frames.

References Cited by the'Exaininer RicHARD' COOKE, JR., Primary Examiner.JOEL REZNEK, JACOB L. NACKENOFF, Examiners.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,190,405 June 22, 1965 Robert K. Squire Column 6, line 33, for"substanially" read substantial] column 8, lines 1 to 3, strike out"pair of base frames and engaged by said extension frame a series ofvertically spaced EDWARD J. BRENNER Commissioner of Patents ERNEST W.SWIDER Attesting Officer

1. AN EXTENDABLE SHORING SCAFFOLD COMPRISING: A PAIR OF HORIZONTALLY SPACED BASE FRAMES; BRACING ELEMENTS INTERCONNECTING SAID BASE FRAMES; A PAIR OF HORIZONTALLY SPACED EXTENSION FRAMES MOUNTED ON SAID BASE FRAMES IN TELESCOPING RELATION; ADAPTER PINS ADJUSTABLY MOUNTED IN SAID BASE FRAMES AND ENGAGED BY SAID EXTENSION FAMES TO SUPPORT THE EXTENSION FRAMES AND THE LOAD CARRIED THEREBY; AND VERTICALLY DIAGONAL BRACING ELEMENTS A STANDARD FRAMES AND SAID ADAPTER PINS TO RIGIDIFY SAID EXTENSION FRAMES AND SAID ADAPTER PINS TO RIDIGIDY SAID EXTENSION FRAMES, SAID STANDARD LENGTH BRACING ELEMENTS INTERCONNECTING THE SAME POINTS ON THE EXTENSION FRAMES AND THE ADAPTER PINS REGARDLESS OF THE POSITION OF THE ADAPTER PINS IN THE BASE FRAMES AND THE AMOUNT OF TELESCOPING OF THE EXTENSION FRAMES IN THE BASE FRAMES. 